James stewart



E T P TM M W M EA T S0 m JT 0 E L E {No Model.)

P atented Feb. 4, 1890 WITNESSES:

annexed drawings,

UNITED STATES JAMES STE\VART, OF NElV YORK,

PATENT IFFICE.

N. Y., ASSIGNOR OF ONE-HALF TO EDMUND STANTON, OF SAME PLACE.

ELECTRIC- LAM P ADAPTER.

SPECIFICATION forming part of Letters Patent No. 420,706, dated February 1890- Applieation filed August 4, 1888. Serial No. 281,957. (No model.)

To all whom it may concern.-

Be itknown that I, JAMES STEWART, of the city, county, and State of New York, have invented a new and Improved Electric-Lamp Coupler or Adapter, of which the following 1s a specification, reference being had to the forming a part thereof, in which- Figure l is a perspective view of my improved lamp-adapter, showing the lamp in position for connection with the coupler or adapter. Fig. 2 is an inverted plan view of the coupler or adapter. Fig. 3 is a transverse section taken on line :0 5c in Fig. 2. a transverse section taken on line 7 pin Fig. 2. Fig. 5 is a plan view with the top removed. Fig. 6 is a side elevation of a coupler or adapter designed for connection with the socket by means of a bayonet-joint. Fig. '2. is a side elevation of the coupler or adapter arranged to make aconnection with a socket having central clip-springs for making one of the contacts, and Fig. 8 is a side elevation of the stud which is received between the spring clips of the lamp-socket.

Similar letters of reference indicate corresponding parts in all the views.

The object of my invention is to construct a coupler or adapter by means of which a lamp having terminals in the form of headed studs may be adapted to any of the usual well-known electric-lamp sockets.

My invention consists in' a hollow button of insulating material containing two flat curved springs provided with a screw threaded peripheral band of metal and furnished with changeable contact-screws, all as hereinafter more fully described. The button A is formed of the parts a b, the part a being made of insulating material in the shape of a cup, which is adapted to receive the part b, of similar material. The periphery of the part a, is surrounded by a sheet-metal band 0, spun into the form of a screw-thread, which is adapted to fit screw-threaded lamp-sockets. In the top of the cup-shaped part Ct are formed curved key-slots d, for receiving the headed studs 6, forming the terminals of (the lam i-base B and in the u per surface of the 1 v part b are formed curved cavities 7", over Fig. 4. is

which are supported the free ends of the curved flat springs g g. The spring gis pro" vided with an arm h, which extends from the heel of the spring to the center of the part b. In the heels of the springs g g are formed holes 1' 'i for receiving the screws j j, which clamp the springs in their places, and also hold the two parts of the button together. The screws j j are provided with shoulders which bear upon the springs. and form an electrical contact. The end of the arm h, which is at the center of the button A, is apertured to receive the threaded end of the screw. The free ends of the springs g g are supported opposite the larger ends of the key-slots (Z in the part a. In the part b is formeda recess, to which is fitted an apertured metallic plate k, which extends over the edge of the band 0, and is held in place by the screw 3'' \Vhen the coupler or adapter is to be received in a socket slotted for abayonet-joint connection, screws Z are inserted at diametrically-opposite points in the edge of the button. To fit my coupler or adapter to a socket provided with two curved flat springs, the screws jj are inserted, as shown in Figs. 2 and 3.

When it is desired to apply my coupler or adapter to a socket having a central fiat spring and a threaded socket, the screw is removed from the side hole and placed in the central hole m, where it formsa connection with the spring g through the arm h.

\Vhen it is desired to apply the coupler or adapter to a screw-threaded lamp-socket provided with a central clip-spring for making one of the connections, the screw '12 having an elongated head, as shown in Figs. 7 and 8, is inserted in the central hole 771, and when it is desired to make connection with a lamp having a metallic socket which forms no part of the circuit the apertured plate is removed.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In an electrical lamp coupler or adapter, a button formed of the cup-shaped part a, having curved key-slots (Z, the part b, fitted to the part (1 and furnished with curved reeessesf, the spring r having the arm 7:, the spring y, the shouldered screws 1' adapted to clamp the springs g g in the position of use, and the peripheral band r, substantially as specified.

2. In an electrical lamp coupler or adapter, 3 button formed of the cup-shaped part a, having curved keyslots (l, the part Z1, fitted to the part a and furnished with curved recesses f, the spring having the arm 70, the spring g, the shouldered screws jj', adapted to clamp the springs g g in the position of use, the peripheral band 0, and the apertured plate 7;, adapted to form an electrical contact 15 with the peripheral hand 0, substantially as specified.

In an electrical lamp coupler or adapter, the combination, with the springs g g, of the screw or, having an elongated. head and adapted to form an electrical connection with the spring g, the screw j,the apertured plate 7r, and the peripheral band 0, substantially as specified.

JAMES STEWART.

Witn esses:

C. SEDGWICK, E. M. CLARK. 

